<span>It is true that the first trimester is the most critical time for an embryo or a fetus. This is because there are many crucial developmental stages in this time period in order to produce a viable and functional multicellular organism. Such developmental characteristics in this period include the successful formation of the notochord, the basic nerve structures and the beating heart. It is critical for such structures and organs to form properly in order to ensure subsequent developments in the fetus to form correctly and ultimately result in a successful deliverance.</span>
All of the above would be the best answer because they all involve using your body in a physical way to release the stress you may or have incurred. Stress can be harmful on the body. For example: You may not be sleeping well because you are stressed. Performing cardio such as running or lifting weights could help your body tire and release that stress so you may sleep easier at night. Or perhaps you are stressed because you cannot focus. Performing stretches or yoga could help you relax and relieve stress so that you may be able to focus better.
It is (B) it is strange but it does weaken the immune system
